Electrically-operated audible signal device



Jan. 22, 1935. J. R. PUTNAM l ELECTRICALLY OPERATED AUDIBLE SIGNAL DEVICE Filed May 8, 1951 Gym@ Patented Jan. 22, 1935 a corporation Application May fs, `1931, serial No'. 535533 j 4 claims. (c1. 17 v--nj This invention relates to .an improvement in electrically-operated audible-signal devices, lsuch las electricxbella Hbuzzers, etc., and .particularly to audible-signaldevices of 'the type designed lprimarily vfor operation by alternating electric current. k

Thelmai'n 'object of this invention is to provide, at a .low "cost for manufacture, a simple, reliable and effective electric audible-signal `device-capable of being operated vpreferably by alternating electric current.

'Withtheabove and other objects in view as willfappear from the following, my invention consists-in 'an electrically-operated audible-sig- 'nal :device characterized by electromagnetic means for lproducing a pulsating magnetic flux inconsonance with an alternating electric current; ahammer or striker vibrating in `response :to the said pulsating magnetic flux; and a .sounding-membensuchas a bell or gong,'made of magnetic material; the .elements referred to being'constructed and arranged so that a magnetic circuit is provided in which thel said sounding-member and the said striker form links respectively.. i Y,

My invention further consists in an electrically-operated audible-signal device characterized as above and having certain other details of construction and combinations of parts as will be hereinafter more particularly described and claimed. p

In the accompanying drawing:

Fig. 1 is aview in side elevation of one form which an electrically-operated audible-signal constructed in accordance with my invention may assume;

Fig. 2 is a side view thereof but viewing the device from a right angle to the position in which it is shown in Fig. 1;

Fig. 3 is a top or plan view thereof; and

Fig. 4 is a central longitudinal sectional view taken on the line 4-4 of Fig. 3.

The particular electrically-operated audiblesignal device herein chosen for the illustration of my invention comprises, as shown, an electric coil or solenoid having end-flanges 11 and 12 formed of insulating material and respectively located at its opposite ends. Y

Extending axially through the coil 10 just re-r ferred to is a core 13 of iron, or other suitable magnetic material, the lower end of which extends through the horizontal arm 14 of an L- shaped bracket 15, also of magnetic material, and over the underface of which its terminal 16 is riveted.

-thence backto the core.

l3 by bearing at, its lower end against Ltheru'pperface of the arm 14 of the bracketrl15, in which -position'it is Aheld by Va .retaining-washer Torring 17-bearing against the upperface o'f `.its

top-ange 1-1, as clearly shown in,Fig....4. y'

The corev 13 extends slightly abovethezcoil 10 to lform a supporting-stud y18 `having .aiconical upper terminallg upon which .rests `the .sound- 1ing-membeni;preferably ra y concavo-convex :bell

or gong 120 formed of magnetic :material .sand havingV the upper endof the coil ;10 and its .core

V13 extending :Within itshollow .underfaca ,They upper `end of the core 13 is formed with an upwardly-opening axial `bore "21 into'fwhich `isgthreaded'the lower end of alscrewl22fextending through the bell or gong` 20-and=serving-fto -rmlyanchor theysamein; place. j f

rllhe .L-shaped bracket in faclditioricto =the horizontal arm 1-4 alreadygreferred .rto,:is providedalso with a'depending arm 23..to,the1out er face, ofwhic'h is secured :by meansnofmivets: 24 and '25 vthe lower endof :a 'flat .sheet-.metalf spring 26. which extends upwardly beyond the said bracket and has secured to the inner face of its upper end an armature-like hammer or striker 27, preferably of rectangular shape and formed, preferably, of relatively-heavy sheet-iron.

AThe 'sheet-metal spring 26 is preferably formed of steel or other magnetic material and rhas the hammer or striker 27 just referred to secured to its upper end by means of rivets 28 and 29, the upper one of which latter is preferably made of non-magnetic material and is arranged in position to engage the outer surface ofthe rim of .the bell or gong as the hammer is vibrated. The employment of a non-magnetic rivet, such as 28, to engage the bell or gong as of travel and will flow through the core 13, bell 20, striker 27, spring 26 and bracket 15, and It being understood, of course,'that when the coil 10 is energized by an alternating current, the magnetic flux will first ow in one direction and then in another, with the result that the striker or hammer 27 forming a link in the magnetic path will be vibrated back and forth to strike the bell 20.

Preferably, the spring 26 which forms a resilient mount for the hammer or striker 27, will be so vrelated in its tension to the mass of the said striker that its period .of vibration will be substantially harmonic to the pulsations ofthe magnetic ux generated by the current flowingA through the coil 10. i y

By soconstructing and arranging the parts of my improved device so that the vbell,v or other sounding-member, provides a path for'the magnetic flux which vibrates the armature-like` striker 27, or other suitable member, I have suc'" ceeded in producing an audible-,signalwhich will operate satisfactorily in response to relatively# high-frequency alternating` current, such` as, :six-` ty-cycle current, with the minimum expenditure of electrical energy.

It will be understood byl those ,skilledinhthe art that my invention may assume varied physical forms Without departing from my inventive tion between said core and striker, the winding of said-'electromagnet designedand adapted to -belconnectedwith asource of alternating electricv current, whereby a magnetic flux is produced in said sounding-member responsive to the `pulsations of l.said current to impart vibra-- tory striking movement to said striker-With re'h v spect to said sounding-member. 1 z 4. y 2.. In analternating-.current electrically-operated f audible-signal device, f fa iiXedly-mounted Asaid sounding-member.:

electromagnet having a core and a winding, a sounding-member of magnetic material fxedly carried by and magnetically connected with one end of said core, a bracket of magnetic material magnetically connected to the opposite end of saidcore, a resilient member of magnetic materialconnected to said bracket, and a vibratory striker of magnetic materialconnected to said resilient'member and extending a major portion of, the distance between said bracket and said sounding-member.

' '3; In'v an alternating-current electrically-operated audible-signal device, a xedly-mounted electromagnet having a core and a Winding, a sounding-member of magnetic material xedly carriedby and magnetically connected with one end of saidy core, an L-shaped bracket of magnetic material having one arm magnetically connected to the opposite end of said core and having the other end extending away from said sounding member, a resilient member connected to the other arm ofv said bracket, and a vibratory=striker lor magnetic material connected to said resilient member and extending a major portion of the distance between said bracket and said sounding-member. l V

4. In an alternating-current electrically-operated audible-signal device, a flXedly-mounted electromagnet having a core and a winding, a sounding-member of magnetic material xedly carried by and magnetically connected with one `end of said core, va bracket of magnetic material magneticallyy connected to the opposite end of said. core, a resilient member of magnetic material connected to said bracket, and a vibratory Vstriker of magnetic 4materialconnected to said resilient` member Yby means including a rionmagnetic rivet positioned toengage said soundingrmember.; and prevent A.direct contact of the magnetic material of said vibratory striker with JAMES.v R. PUTNAM.` 

